.header{
    height: 50px;
}
.box{
    height: 50px;
    padding: 0 10px;
    border-bottom: 1px solid #f5f5f5;
    .a-box{
        color: #999;
    }
}
.bottom{
    height: 60px;
    width: 100%;
    bottom: 0;
}